JAVA中的DES解密的是乱码 javarsa解密

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mob6454cc73e9a6 2023-06-20 22:20:45

文章标签 JAVA中的DES解密的是乱码 java 加密解密 ci 数据 文章分类 Java 后端开发

一、应用情景

JAVA中的DES解密的是乱码 javarsa解密_ci

总结：公钥加密（对方公钥）、私钥解密（自己私钥）；私钥签名、公钥验签。

代码实例

// AES.java
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
/**
 * AES加解密工具
 *
 * @author Created by zqc on 2018/11/02.
 */
public class AES {

    private final static Logger log = LoggerFactory.getLogger(AES.class);

    // 加密。sSrc等待加密的数据；sKey用来加密数据的明文密码
    public static byte[] Encrypt(String sSrc, String sKey) throws Exception {
        if (sKey == null) {
            log.error("Key为空null");
            return null;
        }
        // 判断Key是否为16位
        if (sKey.length() != 16) {
            log.error("Key长度不是16位");
            return null;
        }
        byte[] raw = sKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);//先把明文密码用AES算法加密一下成为AES密码
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));//再用加密后的明文密码（AES密码）来加密数据

        return encrypted;
    }

    // 解密
    public static byte[] Decrypt(byte[] sSrc, String sKey) throws Exception {
        try {
            // 判断Key是否正确
            if (sKey == null) {
                System.out.print("Key为空null");
                return null;
            }
            // 判断Key是否为16位
            if (sKey.length() != 16) {
                System.out.print("Key长度不是16位");
                return null;
            }
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] encrypted1 = sSrc;//先用base64解密
            try {
                byte[] original = cipher.doFinal(encrypted1);
                return original;
            } catch (Exception e) {
                log.error(e.toString());
                return null;
            }
        } catch (Exception ex) {
            log.error(ex.toString());
            return null;
        }
    }
}

//BaseUtils.java
import java.io.*;
import java.util.Base64;
/**
 * BASE64编码解码工具包
 *
 * @author Created by zqc on 2018/11/02.
 */
public class BaseUtils {

    /**
     * 文件读取缓冲区大小
     */
    private static final int CACHE_SIZE = 1024;

    /**
     * BASE64字符串解码为二进制数据
     *
     * @param base64
     * @return
     * @throws Exception
     */
    public static byte[] decode(String base64) throws Exception {
         return Base64.getDecoder().decode(base64);
//        return Base64.decode(base64.getBytes());
    }

    /**
     * 二进制数据编码为BASE64字符串
     *
     * @param bytes
     * @return
     * @throws Exception
     */
    public static String encode(byte[] bytes) throws Exception {
//        return new String(Base64.encode(bytes));
        return Base64.getEncoder().encodeToString(bytes);
    }

    /**
     * 将文件编码为BASE64字符串  大文件慎用，可能会导致内存溢出
     *
     * @param filePath 文件绝对路径
     * @return
     * @throws Exception
     */
    public static String encodeFile(String filePath) throws Exception {
        byte[] bytes = fileToByte(filePath);
        return encode(bytes);
    }

    /**
     * <p>
     * BASE64字符串转回文件
     *
     * @param filePath 文件绝对路径
     * @param base64   编码字符串
     * @throws Exception
     */
    public static void decodeToFile(String filePath, String base64) throws Exception {
        byte[] bytes = decode(base64);
        byteArrayToFile(bytes, filePath);
    }

    /**
     * 文件转换为二进制数组
     *
     * @param filePath 文件路径
     * @return
     * @throws Exception
     */
    public static byte[] fileToByte(String filePath) throws Exception {
        byte[] data = new byte[0];
        File file = new File(filePath);
        if (file.exists()) {
            FileInputStream in = new FileInputStream(file);
            ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
            byte[] cache = new byte[CACHE_SIZE];
            int nRead = 0;
            while ((nRead = in.read(cache)) != -1) {
                out.write(cache, 0, nRead);
                out.flush();
            }
            out.close();
            in.close();
            data = out.toByteArray();
        }
        return data;
    }

    /**
     * 二进制数据写文件bytes 二进制数据
     *
     * @param filePath 文件生成目录
     */
    public static void byteArrayToFile(byte[] bytes, String filePath) throws Exception {
        InputStream in = new ByteArrayInputStream(bytes);
        File destFile = new File(filePath);
        if (!destFile.getParentFile().exists()) {
            destFile.getParentFile().mkdirs();
        }
        destFile.createNewFile();
        OutputStream out = new FileOutputStream(destFile);
        byte[] cache = new byte[CACHE_SIZE];
        int nRead = 0;
        while ((nRead = in.read(cache)) != -1) {
            out.write(cache, 0, nRead);
            out.flush();
        }
        out.close();
        in.close();
    }
}

// RSAUtils.java
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

/**
 * <p>
 * RSA公钥/私钥/签名工具包
 * </p>
 * <p>
 * 罗纳德・李维斯特（Ron [R]ivest）、阿迪・萨莫尔（Adi [S]hamir）和伦纳德・阿德曼（Leonard [A]dleman）
 * </p>
 * <p>
 * 字符串格式的密钥在未在特殊说明情况下都为BASE64编码格式<br/>
 * 由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，<br/>
 * 非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全
 * </p>
 *
 * @author Created by zqc on 2018/11/02.
 */
public class RSAUtils {

    /**
     * 加密算法RSA
     */
    public static final String KEY_ALGORITHM = "RSA";

    /**
     * 签名算法
     */
    public static final String SIGNATURE_ALGORITHM = "MD5withRSA";

    /**
     * 获取公钥的key
     */
    private static final String PUBLIC_KEY = "RSAPublicKey";

    /**
     * 获取私钥的key
     */
    private static final String PRIVATE_KEY = "RSAPrivateKey";

    /**
     * RSA最大加密明文大小
     */
    private static final int MAX_ENCRYPT_BLOCK = 117;

    /**
     * RSA最大解密密文大小
     */
    private static final int MAX_DECRYPT_BLOCK = 128;

    /**
     * 生成密钥对(公钥和私钥)
     *
     * @return
     * @throws Exception
     */
    public static Map<String, Object> genKeyPair() throws Exception {
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        keyPairGen.initialize(1024);
        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        Map<String, Object> keyMap = new HashMap<String, Object>(2);
        keyMap.put(PUBLIC_KEY, publicKey);
        keyMap.put(PRIVATE_KEY, privateKey);
        return keyMap;
    }

    /**
     * 用私钥对信息生成数字签名
     *
     * @param data       已加密数据
     * @param privateKey 私钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static String sign(byte[] data, String privateKey) throws Exception {
        byte[] keyBytes = BaseUtils.decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initSign(privateK);
        signature.update(data);
        return BaseUtils.encode(signature.sign());
    }

    /**
     * 校验数字签名
     *
     * @param data      已加密数据
     * @param publicKey 公钥(BASE64编码)
     * @param sign      数字签名
     * @return
     * @throws Exception
     */
    public static boolean verify(byte[] data, String publicKey, String sign)
            throws Exception {
        byte[] keyBytes = BaseUtils.decode(publicKey);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PublicKey publicK = keyFactory.generatePublic(keySpec);
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initVerify(publicK);
        signature.update(data);
        return signature.verify(BaseUtils.decode(sign));
    }

    /**
     * 私钥解密
     *
     * @param encryptedData 已加密数据
     * @param privateKey    私钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey)
            throws Exception {
        byte[] keyBytes = BaseUtils.decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, privateK);
        return getByteArray(encryptedData, cipher, MAX_DECRYPT_BLOCK);
    }

    private static byte[] getByteArray(byte[] data, Cipher cipher, int maxBlockSize) throws IllegalBlockSizeException, BadPaddingException, IOException {
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段解密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > maxBlockSize) {
                cache = cipher.doFinal(data, offSet, maxBlockSize);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * maxBlockSize;
        }
        byte[] endeData = out.toByteArray();
        out.close();
        return endeData;
    }

    /**
     * 公钥解密
     *
     * @param encryptedData 已加密数据
     * @param publicKey     公钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey)
            throws Exception {
        byte[] keyBytes = BaseUtils.decode(publicKey);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK = keyFactory.generatePublic(x509KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, publicK);
        return getByteArray(encryptedData, cipher, MAX_DECRYPT_BLOCK);
    }

    /**
     * 公钥加密
     *
     * @param data      源数据
     * @param publicKey 公钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] encryptByPublicKey(byte[] data, String publicKey)
            throws Exception {
        byte[] keyBytes = BaseUtils.decode(publicKey);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK = keyFactory.generatePublic(x509KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, publicK);
        return getByteArray(data, cipher, MAX_ENCRYPT_BLOCK);
    }

    /**
     * 私钥加密
     *
     * @param data       源数据
     * @param privateKey 私钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
            throws Exception {
        byte[] keyBytes = BaseUtils.decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, privateK);
        return getByteArray(data, cipher, MAX_ENCRYPT_BLOCK);
    }

    /**
     * 获取私钥
     *
     * @param keyMap 密钥对
     * @return
     * @throws Exception
     */
    public static String getPrivateKey(Map<String, Object> keyMap)
            throws Exception {
        Key key = (Key) keyMap.get(PRIVATE_KEY);
        return BaseUtils.encode(key.getEncoded());
    }

    /**
     * 获取公钥
     *
     * @param keyMap 密钥对
     * @return
     * @throws Exception
     */
    public static String getPublicKey(Map<String, Object> keyMap)
            throws Exception {
        Key key = (Key) keyMap.get(PUBLIC_KEY);
        return BaseUtils.encode(key.getEncoded());
    }

}

// ZASignUtil.java
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Random;
/**
 * 类ZASignUtil的实现描述：加签加密验签解密工具类
 *
 * @author Created by zqc on 2018/11/02.
 */
public class ZASignUtil {

    private final static Logger log = LoggerFactory.getLogger(ZASignUtil.class);

    /**
     * 签名参数生成
     *
     * @param privatekey 我方私钥
     * @param publickey  对方公钥
     * @param param      参数
     * @return 签名之后的JSON格式参数
     * @throws Exception
     */
    public static String paramSign(String privatekey, String publickey, String param) throws Exception {
        //1. 生成AES 16位明文密码
        String encodeRules = getRandomString(16);

        /*私钥加签、公钥验签（我方用我方自己的私钥加签，对方用我方公钥验签）
         我方用自己的私钥对消息加签，形成签名，将加签的消息传递给对方
         对方收到消息后，再获取我方的公钥进行验签，如果验签出来的内容与消息本身一致，证明消息是我方回复的。
        */
        //2.1 用生成的AES密码加密数据内容
        byte[] enContent = AES.Encrypt(param, encodeRules);
        //2.2 使用我方私钥生成签名（签名=我方私钥+AES密码）
        String sign = RSAUtils.sign(enContent, privatekey);

        /*公钥加密、私钥解密（我方用对方的公钥加密，对方用对方自己的私钥解密）
        对方传递自己的公钥给我方，我方用对方的公钥对消息进行加密。
        对方接收到我方加密的信息，利用他们自己的私钥对信息进行解密。
        */
        //3. 使用对方公钥对16位明文密码进行RSA加密
        byte[] enKey = RSAUtils.encryptByPublicKey(encodeRules.getBytes(), publickey);

        //4. 组装成json格式输出
        JSONObject object = new JSONObject();
        object.put("content", BaseUtils.encode(enContent));//AES密码加密数据内容
        object.put("sign", sign); //（签名=我方私钥+AES密码）
        object.put("encodeRules", BaseUtils.encode(enKey)); //RSA算法加密后的16位明文密码
        object.put("timestamp", System.currentTimeMillis()); //当前时间

        String json = object.toJSONString();
        log.info(">>>加签加密后：" + json);
        return json;
    }


    /**
     * 签名校验
     *
     * @param byte_content 接收到的数据
     * @param sign         签名
     * @param publickey    对方公钥
     * @param timestamp    时间戳
     * @return 验签结果
     * @throws Exception 验签失败
     */
    public static boolean checkSign(byte[] byte_content, String sign, String publickey, long timestamp) throws Exception {
        long now = System.currentTimeMillis();
        //5分钟之内请求
        if ((now - timestamp) > 300000) {
            //throw new RuntimeException("非法请求");
        }
        boolean verify = RSAUtils.verify(byte_content, publickey, sign);
        return verify;
    }

    /**
     * 验签 + 解密
     *
     * @param data          原始数据
     * @param c_private_key 我方私钥
     * @param s_public_key  对方公钥
     * @return 解密后的内容
     */
    public static String checkSignDecrypt(String data, String c_private_key, String s_public_key) throws Exception {
        JSONObject parse = JSON.parseObject(data);
        //1. 验证签名
        byte[] byte_content = BaseUtils.decode(parse.getString("content"));
        String sign = parse.getString("sign");
        Long timestamp = parse.getLong("timestamp");
        boolean signd = ZASignUtil.checkSign(byte_content, sign, s_public_key, timestamp);
        if (!signd) {
            throw new RuntimeException("验签失败");
        }
        log.info(">>> 验签" + (signd ? "成功" : "失败"));

        //2.解密数据
        byte[] encodeRules = BaseUtils.decode(parse.getString("encodeRules"));
        return decryptData(byte_content, encodeRules, c_private_key);
    }

    /**
     * 解密数据
     *
     * @param data        加密内容
     * @param encodeRules RSA加密后的AES密码
     * @param privateKey  RSA私钥
     * @return 解密后的数据
     * @throws Exception
     */
    public static String decryptData(byte[] data, byte[] encodeRules, String privateKey) throws Exception {
        //解密RSA算法加密过的AES密码
        byte[] bytesKey = RSAUtils.decryptByPrivateKey(encodeRules, privateKey);
        //用得到的AES密码解密数据内容
        byte[] deContent = AES.Decrypt(data, new String(bytesKey));
        String str_de_content = new String(deContent, "utf-8");
        log.info(">>> 解密后：" + str_de_content);
        return str_de_content;
    }

    static String getRandomString(int length) { //length表示生成字符串的长度
        String base = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        Random random = new Random();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }
}

public static void main( String[] args ) throws Exception {
   		//发送方
        //发送方私钥
        String privatekey = "";
        //接收方公钥
        String publickey = "";
        //发送方传递的信息
        String param = "success";
        //得到加密的数据
        String paramSign = ZASignUtil.paramSign(privatekey, publickey, param);

		//接收方
        //接收方私钥
        String c_private_key = "";
        //发送方公钥
        String s_public_key = "";
        //得到解密数据
        String checkSignDecrypt = ZASignUtil.checkSignDecrypt(paramSign, c_private_key, s_public_key);
    }